a guy's guy
That guy who starts a conversation and then randomly puts his arm around the chair like it’s a hug and he’s best friends with your back.
He started talking and then just put his arm around the chair like it was a hug.
He said hello, talked for five minutes, then just put his arm around the chair and acted like he knew you.
He started the conversation, talked for a while, and then just put his arm around the chair like it was a sign of friendship.